How can I avoid sending two mails to Requester, when closing a request in a Reply to the Requester ?

How can I avoid sending two mails to Requester, when closing a request in a Reply to the Requester ?

We have activated 'Acknowledge requester by e-mail when the request is closed.',
which is fine, because the requester, then gets a notification, when a request is closed from Edit mode or from the right-side menu.

But when a request is given the status 'closed' within a Reply by a Technician, then the Requester gets two mails 
-  thats is the reply-mail    +   the 'Closed'-notification.


Is the a way to avoid this ?

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